ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
The activity of L-arginine decarboxylase (ADC: EC 4.1.1.19)and polyamine content were examine in intact wheat plants (Triticum aestivum L. cv. Sappo) exposed to osmotic stress (0.4 M mannitol) for 5 days. ADC activity was increased in first and second leaves and in roots of mannitol-stressed plants. Concentrations of putrescine, cadaverine and spermine were generally increased in leaves and roots of plants exposed to mannitol, whereas spermidine was reduced in first leaves and roots of these plants. In an attempt to determine the localization of mannitol in stressed wheat. 14C-mannitol was fed to plants grown in liquid culture. Most of the mannitol was detected in roots (84%), while small amounts were found in first (9%) and second (7%) leves.Since it seemed possible that some of the effects on polyamine metabolism caused by exposure to mannitol could have been the result of water stress. polyamine metabolism was also studied in plants water stressed by exposure to 2% polyethylene glycol (PEG) 4000. ADC activity was not altered by exposure to PEG. but concentrations of putrescine, spermidine and spermine were generally reduced in leaves and roots of stressed plants. Cadaverine concentrations were not significantly affected by exposure to PEG. Spermidine and spermine concentrations were reduced in first and second leaves but remained unchanged in roots of plants exposed to PEG.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1991.tb00079.x
